Malicious PDF — malware analysis report

Static analysis result for SHA-256 7678a72960715f46…

MALICIOUS

PDF

65.3 KB Created: 2020-11-24 22:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fd8cbe7afed3f4b6ff04ff7a9c139fab SHA-1: 90d1d4fef9c4163b45595d1e9da2d4f65c1158d2 SHA-256: 7678a72960715f46055d905bf4d6c9288e5885da7d033ae9789ab5e9a1876fd1
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'trafffe.ru', which is likely used to redirect the user to a phishing site. No scripts were extracted, but the presence of the malicious URI and the ML/AV detections strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/strik?utm_term=ap+comparative+government+syllabus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445869/normal_5fa4f9a62949e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_5fa23ea417fec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450721/normal_5fa317de79076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_5f8d2844039c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_5faf526eb14ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5fbb762027360.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f769c3f4-e66d-49d4-851c-edbd693ba103/16782464548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abbc9f8b-cf87-4999-8c43-c4fec4dfa37f/reyes_daniel_ruiz_yahoo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cae94b-5746-4499-bc52-0a54ee703b40/mcoc_synergy_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC302 5544 bytes
SHA-256: 8dad336b80c10c5b598ba278664e38cdfbcf4327086da37658247ab9d45b07fd
font_01_sfnt_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 10088 bytes
SHA-256: 493969ffafe562deac51cc331c70cc9cf153aa8022d854fab3a44c2f6d414d7e

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